High Fluoride in Water Linked to Lower Children's IQ

A recent U.S. government report has ignited controversy by concluding that fluoride levels in drinking water exceeding the recommended limit are associated with lower IQ in children. This analysis, conducted by the National Toxicology Program (NTP), is the first instance where a federal agency has established a connection—“with moderate confidence”—between elevated fluoride exposure and diminished cognitive abilities in children. The report highlights a review of studies from various countries, including Canada and Mexico, indicating that water containing more than 1.5 milligrams of fluoride per liter correlates with lower IQ scores. The report did not specify the exact IQ points lost due to fluoride exposure, but some studies suggested a decrease of 2 to 5 points in children with higher fluoride levels. Since 2015, U.S. health officials have recommended a fluoridation level of 0.7 milligrams per liter, down from a previous upper limit of 1.2 milligrams. The World Health Organization also sets a safe limit at 1.5 milligrams. Approximately 1.9 million Americans, or 0.6% of the population, receive water with naturally occurring fluoride levels above this threshold. The findings have raised concerns about the health implications for those exposed to high fluoride levels, particularly children and pregnant women. The American Dental Association, which supports water fluoridation, has previously criticized earlier analyses related to fluoride's effects. The NTP's report underscores the need for further research to clarify the potential risks associated with fluoride consumption and to determine appropriate public health measures.